You should read: Somewhere Only We Know by Maurene Goo
As soon as I thought of this rom-com, I thought of Somewhere Only We Know. Because, in this book, you meet Lucky, a famous K-pop star, who just performed her hit song in Hong Kong. Now, back in her hotel room, she is badly craving a hamburger. She never really expects her night to go any different.
Though Jack, the cute boy in the book, isn't a bookstore owner like William in Notting Hill (1999), he is also a really interesting character to follow. He's secretly a paparazzi, so you can imagine all the excitement this book will bring.